The Czech driver caught his rivals napping when he pulled out a huge 17.1sec advantage over the 15.2km opening stage.
A second stage win followed at La Bollène-Vésubie / Moulinet, leaving Černý to head up the field of identical M-Sport Poland Ford Fiesta Rally3 cars by a comfortable 21.2sec.
Flying Finn and reigning FIA Junior WRC champion Sami Pajari was Černý’s closest challenger. He was second fastest on both tests and held a massive 1min 21.19sec over third-placed Enrico Brazzoli.
Hungarian pilot Zoltán László trailed the leaders by 3min 36.7sec to complete the leaderboard in fourth.
• Full coverage from Rallye Monte-Carlo is available on WRC+ All Live here, including every stage broadcast as it happens as well as key interviews, features and expert analysis from the service park.
Finland
Italy
Hungary